WO2014163272A1

WO2014163272A1 - Electrode composition for supercapacitor, cured product of said composition, electrode comprising said cured product, capacitor comprising said electrode, and manufacturing method for said supercapacitor

Info

Publication number: WO2014163272A1
Application number: PCT/KR2013/010914
Authority: WO
Inventors: 장윤석; 조정대; 김광영
Original assignee: 한국기계연구원
Priority date: 2013-04-01
Filing date: 2013-11-28
Publication date: 2014-10-09
Also published as: US20140293508A1; EP2983186A4; KR101325952B1; US9318276B2; EP2983186A1; EP2983186B1

Abstract

The present invention relates to: an electrode composition for supercapacitors that solves the problem of functional activated carbon dissolving into the electrolyte solution by using a curable polymer binder; a cured product of said composition; an electrode comprising said cured product; a supercapacitor comprising said electrode, and a manufacturing method for said supercapacitor.

Description

An electrode composition for a supercapacitor, a cured product of the composition, an electrode containing the cured product, a capacitor including the electrode and a method of manufacturing the supercapacitor

The present invention relates to an electrode composition for a supercapacitor, a cured product of the composition, an electrode including the cured product, a supercapacitor including the electrode, and a method of manufacturing the supercapacitor.

Capacitors are another form of energy storage. Capacitors separate two metal plates by a certain distance, put a dielectric between them, apply a voltage, and a charge ion layer is formed across the electrodes to store electricity. In this case, electricity is not generated by chemical reactions like batteries, but simply by electrical double layers. Therefore, the life of the electrode is almost infinite because it does not damage the electrode itself. In addition, since the charge and discharge time is not long, a large amount of current can be stored in a short time. Therefore, this device is an essential electrical storage when high power is needed.

The only disadvantage of capacitors is their poor electrical storage capacity. The storage capacity of the capacitor is inversely proportional to the distance between the two plates and is proportional to the area. If you think that the distance is fixed, you can increase the area of the electrode plate. However, the larger the surface area, the larger the uselessness. Therefore, the effective area should be increased, not the surface area. This effective area is usually increased by making small holes in the electrodes.

After all, the problem in this area is to find an electrode material with a large effective area and low electrode resistance. Of course, the conductivity of the electrode is good, less energy consumption due to the reduction of joule heat. Activated carbon has been used as a material that satisfies these two conditions. Activated carbon has many pores that are made during the carbonization process, so the effective surface area is wide, and because it is carbon, it has good conductivity.

A super capacitor is a component that is mainly used for the purpose of a battery as a reinforcement of the performance of a capacitor (condenser), especially an electric capacity. Capacitors used in electronic circuits have the function of electrically charging batteries. The basic purpose is to collect power and emit it as needed. It is one of the necessary parts for stable operation of the electronic circuit.

The supercapacitor includes an electrode and an electrolyte layer positioned between the electrodes, and stores an energy by forming an electric double layer on the electrode and the electrolyte.

Since the main component of the electrode is activated carbon, the activated carbon is composed of carbon having a very high specific surface area, and because of the high specific surface area, the electrode has an advantageous structure for forming an electric double layer with the ions of the electrolyte. It has a very advantageous structure for making an electric double layer.

However, the active carbons currently in use are usually very hydrophobic on surfaces made up of carbons. In addition, very hydrophobic polymer binders such as polyvinylidene fluoride are used. Since water-soluble electrolytes have hydrophilic properties, there are many restrictions in forming an effective electric double layer.

In order to solve this limitation, the introduction of a hydrophilic functional group such as -COOH, -OH, etc. on the surface of the activated carbon, that is, when manufacturing the functional activated carbon, is very advantageous for forming an effective electric double layer.

However, since such functional activated carbon has hydrophilic properties on its surface, it has a disadvantage in that it is dissolved in an aqueous electrolyte solution used as an electrolyte.

One embodiment of the present invention is to provide an electrode composition that can prevent the functional activated carbon to be dissolved in the electrolyte solution.

Another embodiment of the present invention is also to provide a cured product of the composition.

Another embodiment of the present invention to provide an electrode including the cured product.

Another embodiment of the present invention to provide a super capacitor including the electrode.

Another embodiment of the present invention is to provide a method of manufacturing the super capacitor.

One embodiment of the present invention provides an electrode composition comprising activated carbon and a curable polymer binder.

According to one embodiment of the invention, the activated carbon may comprise a hydrophilic functional group.

As the hydrophilic functional group, the functional group is selected from -COOH, -OH, -SO ₃ H, -NH ₂ , -NH ₄ , -SO ₃ , -COOM (M is an alkali metal or NH ₄ ), = O, -CO May be one or more

The curable polymer binder may be at least one selected from a thermosetting polymer binder and a photocurable polymer binder.

The curable polymer binder may comprise a hydrophilic functional group. According to one embodiment of the invention, the curable polymer binder may be a compound represented by the following formula (1).

[Formula 1]

Wherein R ₁ is an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 18 carbon atoms, or (—CH ₂ CH—) _n , n is an integer of 1 to 20,000, R ₂ is —OH, —COOH, -SO ₃ H, -NH ₂ , -NH ₄ , -SO ₃ , -COOM, = O or -CO, M is an alkali metal or NH ₄ .

According to one embodiment of the invention, the curable polymer binder may be a compound represented by the following formula (2).

[Formula 2]

Wherein n is an integer from 1 to 30,000.

The electrode composition according to the present invention may further comprise a crosslinking agent and a solvent.

In the present invention, the crosslinking agent may be a compound represented by Formula 3 below.

[Formula 3]

In the above formula, R ₃ to R ₆ are each independently hydrogen, an alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 18 carbon atoms, and m is an integer of 1 to 1,000.

In the present invention, the solvent may be a compound represented by the following formula (4).

[Formula 4]

In the electrode composition according to the present invention, the total amount of the curable polymer binder and the crosslinking agent based on 100 parts by weight of the activated carbon may be 1 part by weight to 100 parts by weight.

In the electrode composition according to the present invention, the combined amount of the activated carbon, the curable polymer binder, and the crosslinking agent based on the solvent volume may be 0.01 w / v% to 10 w / v%.

In addition, the present invention provides a cured product of the above-described composition, wherein the curable polymer binder may form a network of three-dimensional crosslinked structure.

The present invention also provides an electrode comprising the cured product.

In addition, the present invention is a pair of current collectors; A pair of electrodes formed to face each of the pair of current collectors and including the cured product; An electrolyte layer formed by being injected between the pair of electrodes; And it provides a super capacitor comprising a separator inserted into the electrolyte layer.

The electrode of the supercapacitor according to the present invention may have a thickness of 1 nm to 2 μm and may be transparent or translucent.

In addition, the present invention comprises the steps of coating a composition comprising activated carbon, a curable polymer binder, a crosslinking agent and a solvent on each of the pair of current collectors; Curing the composition to form a pair of opposite electrodes; Injecting an electrolyte between the pair of electrodes; Inserting a separator into the electrolyte; And it provides a method of manufacturing a super capacitor comprising the step of sealing.

In the manufacturing method of the supercapacitor according to the present invention, the thickness and transparency of the electrode may be controlled by controlling the number of coating of the composition.

In the present invention, it is possible to solve the problem of functional activated carbon by introducing a curable polymer binder. In the case of using the curable polymer binder, it is possible to ink functional functional carbon so that various coating processes (usually most coating processes) can be applied.

Since the curable polymer binder forms a network of three-dimensional crosslinked structure, the functional activated carbon can be effectively prevented from falling into the electrolyte solution. Since the network formed by the curable polymer binder is only absorbed (not swelled), the supercapacitor electrode can provide a very advantageous function by forming the maximum electric double layer through absorption of the electrolyte.

The network formed by the curable polymer binder ensures the conductivity of the supercapacitor electrode without a conductive agent. Functional activated carbon having a hydrophilic property on its surface has a high affinity with an aqueous electrolyte solution used as an electrolyte, thereby maximizing the formation of an electric double layer. The curable polymer binder can prevent the functional activated carbon from dissolving in the aqueous electrolyte solution through network formation. The curable polymer binder can form a structure capable of producing sufficient conductivity without a conductive agent by reducing the distance between functional activated carbons through network formation.

1 is a cross-sectional view schematically showing a stacked structure of a super capacitor.

2 is a graph showing the filling capacity according to the amount of the curable polymer binder (PVP) and the crosslinking agent.

3 is a graph showing the electrode thickness according to the number of coating of the electrode composition.

4 is an electrode photograph according to the number of coating of the electrode composition.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

An electrode composition according to an embodiment of the present invention may include activated carbon and a curable polymer binder. The electrode composition may further include a crosslinking agent and a solvent. According to a preferred embodiment of the present invention, the electrode composition may comprise activated carbon, curable polymer binder, crosslinking agent and solvent.

As the main component of the electrode composition, the activated carbon is a porous material having a large effective area and excellent conductivity and low electrode resistance. The activated carbon may be used in the form of a nano powder, for example, it may be used in the form of nano powder having a size of 1 nm to 1,000 nm.

The activated carbon may preferably be a functional activated carbon. Functional activated carbon is the introduction of a hydrophilic functional group, that is, a hydrophilic functional group, on the surface of the activated carbon. In this case, the hydrophilic functional groups to be introduced are selected from -COOH, -OH, -SO ₃ H, -NH ₂ , -NH ₄ , -SO ₃ , -COOM (M is an alkali metal or NH ₄ ), = O, -CO It may be one or more. As the activated carbon into which such hydrophilic functional groups have been introduced, for example, activated carbon having one or more hydrophilic functional groups introduced therein may be used, and activated carbon having many hydrophilic functional groups introduced therein may be used.

The introduction of such hydrophilic functional groups onto the surface of activated carbon, ie when producing functional activated carbon, is very advantageous for forming an effective electrical double layer.

The curable polymer binder serves to form a cured product when the electrode composition of the present invention is cured, and in particular, serves to form a network of three-dimensional crosslinked structure in the cured product.

As said curable polymer binder, 1 or more types chosen from a thermosetting polymer binder and a photocurable polymer binder can be used. For example, one kind of thermosetting polymer binder can be used, several kinds of thermosetting polymer binders can be used in combination, and also one kind of photocurable polymer binder can be used, and several kinds of photocurable polymer binders can be used. May be used in combination, and one or several kinds of thermosetting polymer binders and one or several kinds of photocurable polymer binders may be used in combination.

The curable polymer binder may include a hydrophilic functional group like the activated carbon, wherein the hydrophilic functional group is -COOH, -OH, -SO ₃ H, -NH ₂ , -NH ₄ , -SO ₃ , -COOM (M Silver may be one or more selected from alkali metals or NH ₄ ), ═O, —CO. When using a curable polymer binder containing such hydrophilic functional groups, it is advantageous to form an effective network in combination with functional activated carbon, and also to form an effective electric double layer.

The weight average molecular weight (Mw) of the curable polymer binder may be 500 to 500,000.

Preferably, as the curable polymer binder containing a hydrophilic functional group, a compound represented by the following formula (1) may be used.

[Formula 1]

Wherein R ₁ is an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 18 carbon atoms, or (—CH ₂ CH—) _n , n is an integer of 1 to 20,000, R ₂ is —OH, —COOH, -SO ₃ H, -NH ₂ , -NH ₄ , -SO ₃ or -COOM, = O, -CO, M is an alkali metal or NH ₄ .

More preferably, the compound represented by the following formula (2) can be used as the curable polymer binder containing a hydrophilic functional group.

[Formula 2]

Wherein n is an integer from 1 to 30,000.

The compound of Formula 2 is poly (4-vinylphenol) (Poly (4-vinylphenol: hereinafter referred to as PVP). The weight average molecular weight (Mw) of the PVP may be 100,000 or less, and may be 500 to 100,000. The PVP may have a weight average molecular weight of 50,000 or less and 5000 to 50,000.

The crosslinking agent combines with the curable polymer binder to form a three-dimensional network of crosslinked structures in the cured product. Although the crosslinking agent which can be used by this invention is not specifically limited, The number average molecular weight (Mn) can use what is 50-500,000.

Suitable crosslinking agents in one embodiment of the present invention include compounds represented by the following formula (3).

[Formula 3]

In the above formula, R ₃ to R ₆ are each independently hydrogen, an alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 18 carbon atoms, and m is an integer of 1 to 1,000. Preferably, R ₃ to R ₆ may be each independently hydrogen or a methyl group.

More preferably, poly (melamine-co-formaldehyde) methylated (poly (melamine-co-formaldehyde), methylated) may be used as the compound of Formula 3, wherein the number average molecular weight (Mn) is 10,000 or less. And may be 400 to 10,000. The number average molecular weight (Mn) of the poly (melamine-co-formaldehyde) methylated (poly (melamine-co-formaldehyde), methylated) may be 1,000 or less, and may be 400 to 1000.

The solvent serves to form the electrode by a method such as coating by including each component of the electrode composition in a dissolved state and / or dispersed state. The solvent usable in the present invention is not particularly limited, but preferably, a compound represented by the following Chemical Formula 4 may be used.

[Formula 4]

The compound of Formula 4 is propylene glycol methyl ether acetate.

In the electrode composition according to the present invention, the total amount of the curable polymer binder and the crosslinking agent based on 100 parts by weight of the activated carbon may be 100 parts by weight or less. That is, the curable polymer binder and the crosslinking agent may be used in an amount equal to or less than the activated carbon. The amount of the curable polymer binder and the crosslinking agent is 1 to 100 parts by weight based on 100 parts by weight of the activated carbon based on the sum of the two components. Parts, preferably 1 to 50 parts by weight. If the amount of the curable polymer binder and the crosslinking agent is too small relative to the amount of activated carbon, the activated carbon may be separated from the formed electrode. On the contrary, when the amount of the curable polymer binder and the crosslinking agent is too high compared to the amount of activated carbon, the electrode resistance may increase while the conductivity is lowered. As the curable polymer binder plays a role of a binder together with a crosslinking agent, the amount of the curable polymer binder and the crosslinking agent is important, and the ratio of the curable polymer binder and the crosslinking agent is not an important factor, and is suitably within the range of use of the curable polymer binder and the crosslinking agent. I can regulate it.

In the electrode composition according to the present invention, the combined amount of the activated carbon, the curable polymer binder, and the crosslinking agent based on the solvent may be 10 w / v% or less. That is, most of the electrode composition according to the present invention is occupied by a solvent, and the sum of the remaining components except for the solvent is 0.01 w / v% to 10 w / v%, preferably 0.1 w / v% to 5 w / v%. , More preferably from 0.5 w / v% to 2 w / v%. When the amount of the remaining components except for the solvent is too small, it may be difficult to form the electrode or cured material or the physical properties may be lowered. On the contrary, when the amount of the remaining components other than the solvent is relatively high, coating workability may deteriorate or physical properties may deteriorate.

Moreover, this invention provides the hardened | cured material which hardened the above-mentioned composition by heat or light. The curable polymer binder in the cured product is characterized by forming a network of three-dimensional crosslinked structure together with a crosslinking agent. By forming the network of such a three-dimensional crosslinked structure, it is possible to prevent the problem of the prior art, that is, the functional activated carbon to be dissolved in the electrolyte solution.

The present invention also provides an electrode comprising the cured product. The electrode for the supercapacitor according to the present invention is made of a cured product of the electrode composition according to the present invention, thereby preventing the functional activated carbon from falling off from the formed electrode.

As shown in FIG. 1, the supercapacitor according to the present invention includes a pair of

current collectors

10 and 70, a pair of

electrodes

20 and 60, a pair of electrolyte layers 30 and 50, and a separator 40. It can be composed of).

The

current collectors

10 and 70 may be made of a material such as metal, glass, plastic, or the like. For example, the current collector may be aluminum, nickel, copper, SUS, iron, silver, gold, platinum, transparent indium tin oxide (ITO), poly (3,4-ethylenedioxythiophene) / poly (styrenesulfonate) It may be prepared such as. In addition, the current collector may be a substrate coated with a wire or a coating layer. The wire or coating layer may be a conductive material such as Ag, Au, Al, Ni, Co, Cu, Pt or graphene, carbon nanotubes (CNT), or a metal composite, and the substrate may be polyethylene terephthalate, polyimide, or It may be glass.

The

electrodes

20 and 60 are formed on each of the pair of

current collectors

10 and 70, and are specifically formed to face each other between the

current collectors

10 and 70. As described above, the

electrodes

20 and 60 are made of a cured product of the electrode composition according to the present invention.

The thickness of the

electrodes

20 and 60 is not particularly limited, and may be formed in various thicknesses by controlling the number of coatings. For example, a thickness of 2 μm or less, preferably 10 nm to 1,500 nm, more preferably 100 nm to 1,000 nm, based on the average thickness may be formed for each coating. For example, when a thickness of 0.8 ± 0.5 μm is formed based on the average thickness of each coating, an electrode having a thickness of 5 ± 1 μm may be formed in six repeated coatings.

On the other hand, the thickness of the

electrodes

20, 60 and the transparency is inversely related, that is, the transparency decreases as the thickness of the

electrodes

20, 60 increases, on the contrary, the thinner the thickness of the

electrodes

20, 60 Transparency increases. When the thickness of the

electrodes

20 and 60 is 2 μm or less, a transparent or semitransparent electrode may be obtained. In the present invention, the transparent may refer to the case where the light transmittance exceeds 70%, and the translucent may refer to the case where the light transmittance is 30 to 70%, and the opacity may refer to the case where the light transmittance is less than 30%. have. If a transparent or translucent electrode is required, the number of coatings is limited to about 1 to 2 times to adjust the thickness of the

electrodes

20 and 60 to 2 μm or less, thereby obtaining a transparent or semitransparent electrode. Conversely, if the number of coatings is repeated five or more times, the electrode material becomes opaque with full coverage of the electrode material.

The electrolyte layers 30 and 50 may be injected and formed between the pair of

electrodes

20 and 60.

An aqueous electrolyte can be suitably used as the electrolyte of the electrolyte layer. The aqueous electrolyte may include an electrolytic salt and a solvent. As the electrolytic salt, any of the electrolytic salts used in the aqueous electrolyte may be used, and examples thereof may include acidic electrolytic salts, neutral electrolytic salts, or basic electrolytic salts. Specific examples of the electrolytic salt include sulfuric acid, sodium sulfate, potassium chloride, potassium hydroxide or a combination thereof having high ion conductivity.

Water may be used as the solvent. The concentration of the electrolyte may be about 0.1M to 6M.

The separator 40 is formed between the pair of

electrodes

20 and 60, that is, formed in the middle of the electrolyte layers 30 and 50. The separator 40 is preferably a porous separator having a plurality of pores, the pore of the porous separator is preferably sized to pass only the electrolyte solution. The separator may be cellulose, polyolefin, celgard S-20, rayon, or the like.

First, an electrode composition comprising activated carbon, a curable polymer binder, a crosslinking agent, and a solvent is coated on each of the pair of

current collectors

10 and 70. The coating method is not particularly limited and may use most existing coating processes, for example spray coating, slot die coating, bar coating, blade coating, and the like. have. On the other hand, as described above, it is possible to control the thickness and transparency of the electrode by adjusting the number of coating of the electrode composition.

Next, the coated electrode composition is cured to form a pair of

opposite electrodes

20 and 60. Curing may be accomplished through thermal curing and / or photocuring, for example at a temperature of 150 to 200 ° C. for thermal curing, and by ultraviolet (UV) irradiation for photocuring.

Next, an electrolyte solution is injected between the formed two

electrodes

20 and 60 to form the electrolyte layers 30 and 50. The electrolyte solution may contain a solvent such as an electrolytic salt such as sulfuric acid, sodium sulfate, potassium chloride and the like with high ionic conductivity and water.

Next, in order to prevent the two

electrodes

20 and 60 from contacting each other, the separator 40 is inserted into the electrolyte layers 30 and 50 between the

electrodes

20 and 60.

Finally, the electrolyte solution is sealed so as not to leak to produce the final supercapacitor.

In the present invention, it is possible to solve the problem of functional activated carbon by introducing a curable polymer binder. When using a curable polymer binder, the ink can be functionalized and various coating processes (most of the existing coating processes) can be applied. Since the curable polymer binder forms a network of three-dimensional crosslinked structure, the functional activated carbon can be effectively prevented from falling into the electrolyte solution. Since the network formed by the curable polymer binder is only absorbed (not swelled), the supercapacitor electrode can provide a very advantageous function by forming the maximum electric double layer through absorption of the electrolyte. The network formed by the curable polymer binder ensures the conductivity of the supercapacitor electrode without a conductive agent. Functional activated carbon having a hydrophilic property on its surface has a high affinity with an aqueous electrolyte solution used as an electrolyte, thereby maximizing the formation of an electric double layer. The curable polymer binder can prevent the functional activated carbon from dissolving in the aqueous electrolyte solution through network formation. The curable polymer binder can form a structure capable of producing sufficient conductivity without a conductive agent by reducing the distance between functional activated carbons through network formation.

Hereinafter, specific embodiments of the present invention are presented. However, the embodiments described below are merely for illustrating or explaining the present invention in detail, and thus the present invention is not limited thereto.

[Examples 1 to 6]

Each of the pair of current collectors was coated with an electrode composition comprising activated carbon, curable polymer binder, crosslinking agent and solvent.

The electrode composition was prepared by adding 1 g of activated carbon nanopowder to 100 mL of solvent, and adding the curable polymer binder and the crosslinking agent in the amounts shown in Table 1 in the range of 0.01 to 1 g in a combined amount. In this case, as activated carbon, a functional activated carbon nano powder including -OH, -COOH, -CO, and = O as a hydrophilic functional group was used, PVP (Mw: 20,000) was used as a curable polymer binder, and as a crosslinking agent. Poly (melamine-co-formaldehyde) methylated (Mn: 511) was used and propylene glycol methyl ether acetate was used as the solvent.

The coating process was carried out five times, using a spray coating. Thereafter, the coated electrode composition was thermally cured at 180 ° C. to form a pair of electrodes facing each other, and then an electrolyte solution was injected to form an electrolyte layer between two formed electrodes. As the electrolyte solution, a water solution in which 1 M sodium sulfate was dissolved was used. Subsequently, a porous separator was inserted into the electrolyte layer between the two electrodes, and the electrolyte solution was sealed to prevent leakage of the electrolyte to prepare a supercapacitor.

[Test Example]

For the supercapacitors prepared according to Examples 1 to 6, it was tested whether the activated carbon was separated from the electrode depending on the amount of the curable polymer binder (PVP) and the crosslinking agent. This experiment was conducted 50 times at a scan rate of 1000 mV / S with a three-electrode system comprising a Pt mesh counter electrode, an Ag / AgCl (3M KCl) reference electrode and an electrode according to Examples 1-6. The result was visually observed. The results are shown in Table 1 below.

Table 1

	Activated carbon (g)	Binder + Crosslinking Agent (g)	Activated Carbon Desorption
Example 1	One	0.01	Desorption
Example 2	One	0.02	Desorption
Example 3	One	0.05	No desorption
Example 4	One	0.1	No desorption
Example 5	One	0.5	No desorption
Example 6	One	One	No desorption

As shown in Table 1, in Examples 1 and 2 in which the binder and the crosslinking agent were used in combination with 0.01 g or 0.02 g, it can be seen that the activated carbon was separated from the electrode.

For the supercapacitors prepared according to Examples 3 to 6, the charge capacity according to the amount of the curable polymer binder (PVP) and the crosslinking agent was measured. The results are shown in FIG. As shown in Figure 2, the smaller the amount of the binder and crosslinking agent can be seen that the filling capacity increased. That is, from the results of Table 1 and FIG. 2, it can be seen that in order to increase the filling capacity, it is effective to use the binder and the crosslinking agent as little as possible in the range (0.05 g or more) in which the activated carbon does not separate from the electrode.

(Example 7)

The same procedure as in Example 3 was carried out except that the coating was performed once.

(Example 8)

The same procedure as in Example 3 was carried out except that the coating was performed twice.

(Example 9)

The same procedure as in Example 3 was carried out except that the coating was performed three times.

(Example 10)

The same procedure as in Example 3 was carried out except that the coating was performed four times.

(Example 11)

The same procedure as in Example 3 was carried out except that the coating was performed six times.

In order to determine the thickness change according to the number of coating, the electrode thicknesses of Examples 7 to 11 were measured. In addition, the electrode thickness of Example 3 was measured. The results are shown in FIG. As shown in FIG. 3, as the number of coatings increased, the electrode thickness became thicker, and in particular, the coating thickness increased by about 0.8 ± 0.5 μm as the average thickness for each coating.

Figure 4 shows the electrode picture according to the number of coating of the electrode composition of Example 7 and Example 3. As shown in FIG. 4, when only one coating was performed, a transparent or translucent electrode was obtained, and when the coating was repeated five or more times, the electrode material covered the entire surface.

The present invention is not limited to the above embodiments, but may be manufactured in various forms, and a person skilled in the art to which the present invention pertains has another specific form without changing the technical spirit or essential features of the present invention. It will be appreciated that the present invention may be practiced as. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

Claims

An electrode composition comprising activated carbon and a curable polymer binder.
The method of claim 1,

The curable polymer binder is an electrode composition, characterized in that at least one selected from a heat curable polymer binder and a photocurable polymer binder.
The method of claim 1,

The activated carbon and the curable polymer binder comprise a hydrophilic functional group.
The method of claim 3,

The hydrophilic functional group is at least one selected from -COOH, -OH, -SO 3 H, -NH 2 , -NH 4 , -SO 3 , -COOM (M is an alkali metal or NH 4 ), = O, -CO Electrode composition, characterized in that.
The method of claim 1,

The curable polymer binder is an electrode composition, characterized in that the compound represented by the formula (1):

[Formula 1]

Where

R 1 is an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 18 carbon atoms, or (-CH 2 CH-) n ,

n is an integer from 1 to 20,000,

R 2 is —OH, —COOH, —SO 3 H, —NH 2 , —NH 4 , —SO 3 , —COOM, = O or, —CO,

M is an alkali metal or NH 4 .
The method of claim 1,

The curable polymer binder is an electrode composition, characterized in that the compound represented by the formula (2):

[Formula 2]

Where

n is an integer from 1 to 30,000.
The method of claim 1,

An electrode composition further comprising a crosslinking agent and a solvent.
The method of claim 7, wherein

The crosslinking agent is an electrode composition, characterized in that the compound represented by the formula (3):

[Formula 3]

Where

R 3 to R 6 are each independently hydrogen, an alkyl group having 1 to 10 carbon atoms, or an aryl group having 6 to 18 carbon atoms,

m is an integer from 1 to 1,000.
The method of claim 7, wherein

The solvent is an electrode composition, characterized in that the compound represented by the formula (4):

[Formula 4]
The method of claim 7, wherein

The amount of the curable polymer binder and the crosslinking agent is added in an amount of 1 part by weight to 100 parts by weight based on 100 parts by weight of the activated carbon.
The method of claim 7, wherein

The total amount of the curable polymer binder and the crosslinking agent based on 100 parts by weight of the activated carbon is 1 part by weight to 50 parts by weight.
The method of claim 7, wherein

The amount of the activated carbon, the curable polymer binder, and the crosslinking agent in the sum of the solvents ranges from 0.01 w / v% to 10 w / v%.
Hardened | cured material which hardened the composition of Claim 1.
The method of claim 13,

The curable polymer binder in the cured product is characterized in that to form a network of three-dimensional crosslinked structure.
An electrode comprising the cured product of claim 13.
A pair of current collectors;

A pair of electrodes formed to face each of the pair of current collectors and including the cured product of claim 13;

An electrolyte layer formed by being injected between the pair of electrodes; And

A supercapacitor comprising a separator inserted into the electrolyte layer.
The method of claim 16,

The electrode is a super capacitor, characterized in that the transparent or translucent having a thickness of 1 nm to 2 ㎛.
Coating a composition comprising activated carbon, a curable polymer binder, a crosslinking agent, and a solvent to each of the pair of current collectors;

Curing the composition to form a pair of opposite electrodes;

Injecting an electrolyte between the pair of electrodes;

Inserting a separator into the electrolyte; And

Method of manufacturing a super capacitor comprising the step of sealing.
The method of claim 18,

Method of manufacturing a super capacitor, characterized in that for controlling the thickness and transparency of the electrode by adjusting the number of coating of the composition.